How much air flow do I need

The Hippies Were Right

The Hippies Were Right

Active Member
Ok, I am building a ne grow shelf tomorrow and wa wanting some opinions on how much air I need. I will have a 72"Tall x 24" Deep X 48" wide. I am thinking 2 100 to 200 cfm with a small fan for circuatlion. Good enough or not enough or too much. thanks guys
 
323cheezy

323cheezy

Well-Known Member
let me see if i got this right......yoour space is around 6 ft tall 3 ft wide and 2 ft deep....ok gentelmen lets get down to brass task.....i was led to believe this is a closet.....are there any windows around??? how is air coming in the room???? are you gonnna close the closet or leave it open??? are u gonna have to hide it from guests??? personally it sound like you have enough fans.....the more fans the better..... me i have two window open iin my grow room...and my closet is never closed....with only one fan for circulation....if the space needs to be closed shut...youll need air coming in and going out...
 
bonz

bonz

Well-Known Member
i would recomend a 250 cfm fan. you only need one fan, and the oscilating room fan
 
The Hippies Were Right

The Hippies Were Right

Active Member
Not in closet. Its in my bedroom. And its not a small bedroom (even have vaulted cellings.) I am going to wrap the shelf with panada film Use one fan for intake and one for esuast. Only using fl. lighting so lower heat. (At least for now may get a small hps for flowering)
 
323cheezy

323cheezy

Well-Known Member
well if you have big windows, some fans blowing air from outside....you dontt need all those crazy fans....celing fan maybe and one blowing on the plants....but when you start to conceal them from light you may need those fans...
 
bonz

bonz

Well-Known Member
your going to need to contain it for the light, any pic`s of the erea you want to use
 
desertrat

desertrat

Well-Known Member
bonz is right, you need to enclose your shelf or keep the room completely dark for 12 hrs pr day during flowering. and unless you want your neighborhood to smell you are going to need to enclose for odor control also
 
bonz

bonz

Well-Known Member
also if you dont contain the grow erea you will lose lumens from only using flouro`s.
you will lose the side lighting because of no reflectivity down the sides
 
N

NoDrama

Well-Known Member
You want about 3 times your volume of air moved out every minute, so 6x3x2=36, 36x3=108 CFM fan needed for that space.
 
The Hippies Were Right

The Hippies Were Right

Active Member
I am going to get it in the morning. Don't get paid till mid night and HD is close then. (why can't everything be 24 hrs). Also whats some good ways to get Humidity up? Can't ever seem to break 30%.
 
B

buds o' plenty

Active Member
dude, walmart carries a rubbermaid shelving unit that is half the cost. that is wahat i use to veg. it comes with 5 shelves and a bunch of tubes. you can put the tubes together and make a large area by using a shelf as the base and then putting two - three tubes together and a shelf at top to keep it all rigid. we wrap it with a black and white plastic that we buy at the local hydro store.. check the pic. 35 bucks walmart:blsmoke::blsmoke:
 

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bonz

bonz

Well-Known Member
thats alot of air for a small box. i would put a speed controler on the intake fan and dial it right down or not use it at first, you may not need it. to much intake and you wont get your neg pressure
 
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